CVE-2025-49812
BaseFortify
Publication date: 2025-07-10
Last updated on: 2025-11-04
Assigner: Apache Software Foundation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apache | http_server | to 2.4.64 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-287 | When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an HTTP desynchronisation attack affecting certain mod_ssl configurations on Apache HTTP Server versions up to 2.4.63. It allows a man-in-the-middle attacker to hijack an HTTP session by exploiting the TLS upgrade process when the server is configured with "SSLEngine optional".
How can this vulnerability impact me? :
An attacker performing this HTTP desynchronisation attack can hijack your HTTP session, potentially gaining unauthorized access to sensitive information or actions within that session.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade Apache HTTP Server to version 2.4.64 or later, which removes support for TLS upgrade and thus prevents the HTTP desynchronisation attack. Additionally, avoid using the "SSLEngine optional" configuration that enables TLS upgrades.